You have attempted to paste your PHP into a text widget. and the tags have been transformed.
<div class="textwidget"> <!--?php if (is_category('5')) { ?-->
You can’t execute PHP from a text widget by default, and I would not recommend trying to do so (it should be possible). Instead, it is trivial to build your own widget to do this.
Based on that other answer:
class PHP_Widget_wpse_135949 extends WP_Widget {
function __construct() {
$opts = array(
'description' => 'Display Some ads'
);
parent::WP_Widget(
'my-ad-content',
'Some PHP',
$opts
);
}
function widget($args,$instance) {
// Your PHP goes here
//
echo 'PHP generated content';
}
}
function register_my_widgets() {
register_widget('PHP_Widget_wpse_135949');
}
add_action('widgets_init','register_my_widgets');
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